Dental Materials exam 1
What does the FDA do? has regulatory jurisdiction over the safety and efficacy of medical and dental
materials and devices
What does OSHA do? responsible for formulating and enforcing provisons that assure a safe
environment for all employees
what are the requirements for a seal of acceptance? (5) Clinical trials
data from studies to support
reproducible
promotional materials
ingredients
what is strain? amount of change or the difference between a natural and extended state
(distortion/deformation)
compresses a structure commpresive
stretching, pulling, elongating an object tensile
rotate, twist, or parallel slide an object accompanied by strain shear
, what is solubilty? the ability of a substance to be able to dissolve into another substance
T/F: it is desirable for most dental materials to have a low solubility true
Ex. of high solubilty tooth colored and glass ionomer cement restorations
Ex of low solubility materials gold, porcelain
what are the effects of acid and moisture? corrosion and fatigue factor
deterioration or dissolution of the metal in response to a chemical attack (acid) or in an electrochemical
reaction with other metals due to moisture and acid corrosion
what is galvanism a small electric current when two unalike metals oppose each other within the same
oral cavity (ex. metal and aluminum).
What are the affects of temperature changes on dental materials alter the size of the restoration
If a liquid is involved in the expansion and contraction of a restoration, what is it referred to as?
percolation
what is the function of conductors transmit temperatures - metals (gold/amalgam)
do not transmit temperatures insulators
ex of insulators enamel, dentin, composites, porcelain, insulating cement)
What does the FDA do? has regulatory jurisdiction over the safety and efficacy of medical and dental
materials and devices
What does OSHA do? responsible for formulating and enforcing provisons that assure a safe
environment for all employees
what are the requirements for a seal of acceptance? (5) Clinical trials
data from studies to support
reproducible
promotional materials
ingredients
what is strain? amount of change or the difference between a natural and extended state
(distortion/deformation)
compresses a structure commpresive
stretching, pulling, elongating an object tensile
rotate, twist, or parallel slide an object accompanied by strain shear
, what is solubilty? the ability of a substance to be able to dissolve into another substance
T/F: it is desirable for most dental materials to have a low solubility true
Ex. of high solubilty tooth colored and glass ionomer cement restorations
Ex of low solubility materials gold, porcelain
what are the effects of acid and moisture? corrosion and fatigue factor
deterioration or dissolution of the metal in response to a chemical attack (acid) or in an electrochemical
reaction with other metals due to moisture and acid corrosion
what is galvanism a small electric current when two unalike metals oppose each other within the same
oral cavity (ex. metal and aluminum).
What are the affects of temperature changes on dental materials alter the size of the restoration
If a liquid is involved in the expansion and contraction of a restoration, what is it referred to as?
percolation
what is the function of conductors transmit temperatures - metals (gold/amalgam)
do not transmit temperatures insulators
ex of insulators enamel, dentin, composites, porcelain, insulating cement)
